Hi there:
So I have WPLMS S3 v 1.0 and it is working great...all files loading etc....the only problem with that plugin is that the files don't show preview in the FREE UNIT POPUPS.
A few minutes ago I tried updating the new version of WPLMS 1.22 (I believe) and it DOESN'T WORK AT ALL.
You should revert to version 1.0 and fix the preview functionality of FREE UNIT POPUPS.
continuing discussion here :
https://wplms.io/support/forums/topic/wplms-s3-issue/page/2/
Older topics are responded earlier.